Merge pull request #14885 from karalabe/trezor-boom

accounts, console, internal: support trezor hardware wallet

accounts/accounts.go

@@ -42,8 +42,9 @@ type Wallet interface {
 	URL() URL
 
 	// Status returns a textual status to aid the user in the current state of the
-	// wallet.
-	Status() string
+	// wallet. It also returns an error indicating any failure the wallet might have
+	// encountered.
+	Status() (string, error)
 
 	// Open initializes access to a wallet instance. It is not meant to unlock or
 	// decrypt account keys, rather simply to establish a connection to hardware
@@ -147,9 +148,26 @@ type Backend interface {
 	Subscribe(sink chan<- WalletEvent) event.Subscription
 }
 
+// WalletEventType represents the different event types that can be fired by
+// the wallet subscription subsystem.
+type WalletEventType int
+
+const (
+	// WalletArrived is fired when a new wallet is detected either via USB or via
+	// a filesystem event in the keystore.
+	WalletArrived WalletEventType = iota
+
+	// WalletOpened is fired when a wallet is successfully opened with the purpose
+	// of starting any background processes such as automatic key derivation.
+	WalletOpened
+
+	// WalletDropped
+	WalletDropped
+)
+
 // WalletEvent is an event fired by an account backend when a wallet arrival or
 // departure is detected.
 type WalletEvent struct {
 	Wallet Wallet          // Wallet instance arrived or departed
-	Arrive bool   // Whether the wallet was added or removed
+	Kind   WalletEventType // Event type that happened in the system
 }

accounts/hd.go

@@ -27,12 +27,17 @@ import (
 // DefaultRootDerivationPath is the root path to which custom derivation endpoints
 // are appended. As such, the first account will be at m/44'/60'/0'/0, the second
 // at m/44'/60'/0'/1, etc.
-var DefaultRootDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0}
+var DefaultRootDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}
 
 // DefaultBaseDerivationPath is the base path from which custom derivation endpoints
 // are incremented. As such, the first account will be at m/44'/60'/0'/0, the second
 // at m/44'/60'/0'/1, etc.
-var DefaultBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}
+var DefaultBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0}
+
+// DefaultLedgerBaseDerivationPath is the base path from which custom derivation endpoints
+// are incremented. As such, the first account will be at m/44'/60'/0'/0, the second
+// at m/44'/60'/0'/1, etc.
+var DefaultLedgerBaseDerivationPath = DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}
 
 // DerivationPath represents the computer friendly version of a hierarchical
 // deterministic wallet account derivaion path.

accounts/hd_test.go

@@ -37,11 +37,11 @@ func TestHDPathParsing(t *testing.T) {
 		{"m/2147483692/2147483708/2147483648/2147483648", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
 
 		// Plain relative derivation paths
-		{"0", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}},
-		{"128", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 128}},
-		{"0'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
-		{"128'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 128}},
-		{"2147483648", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
+		{"0", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0}},
+		{"128", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 128}},
+		{"0'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 0}},
+		{"128'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 128}},
+		{"2147483648", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 0}},
 
 		// Hexadecimal absolute derivation paths
 		{"m/0x2C'/0x3c'/0x00'/0x00", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}},
@@ -52,11 +52,11 @@ func TestHDPathParsing(t *testing.T) {
 		{"m/0x8000002C/0x8000003c/0x80000000/0x80000000", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
 
 		// Hexadecimal relative derivation paths
-		{"0x00", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}},
-		{"0x80", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 128}},
-		{"0x00'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
-		{"0x80'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 128}},
-		{"0x80000000", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0x80000000 + 0}},
+		{"0x00", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0}},
+		{"0x80", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 128}},
+		{"0x00'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 0}},
+		{"0x80'", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 128}},
+		{"0x80000000", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0, 0x80000000 + 0}},
 
 		// Weird inputs just to ensure they work
 		{"	m  /   44			'\n/\n   60	\n\n\t'   /\n0 ' /\t\t	0", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}},

accounts/keystore/keystore.go

@@ -143,14 +143,14 @@ func (ks *KeyStore) refreshWallets() {
 	for _, account := range accs {
 		// Drop wallets while they were in front of the next account
 		for len(ks.wallets) > 0 && ks.wallets[0].URL().Cmp(account.URL) < 0 {
-			events = append(events, accounts.WalletEvent{Wallet: ks.wallets[0], Arrive: false})
+			events = append(events, accounts.WalletEvent{Wallet: ks.wallets[0], Kind: accounts.WalletDropped})
 			ks.wallets = ks.wallets[1:]
 		}
 		// If there are no more wallets or the account is before the next, wrap new wallet
 		if len(ks.wallets) == 0 || ks.wallets[0].URL().Cmp(account.URL) > 0 {
 			wallet := &keystoreWallet{account: account, keystore: ks}
 
-			events = append(events, accounts.WalletEvent{Wallet: wallet, Arrive: true})
+			events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletArrived})
 			wallets = append(wallets, wallet)
 			continue
 		}
@@ -163,7 +163,7 @@ func (ks *KeyStore) refreshWallets() {
 	}
 	// Drop any leftover wallets and set the new batch
 	for _, wallet := range ks.wallets {
-		events = append(events, accounts.WalletEvent{Wallet: wallet, Arrive: false})
+		events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletDropped})
 	}
 	ks.wallets = wallets
 	ks.mu.Unlock()

accounts/keystore/keystore_test.go

@@ -296,8 +296,8 @@ func TestWalletNotifications(t *testing.T) {
 			}
 			select {
 			case event := <-updates:
-				if !event.Arrive {
-					t.Errorf("departure event on account creation")
+				if event.Kind != accounts.WalletArrived {
+					t.Errorf("non-arrival event on account creation")
 				}
 				if event.Wallet.Accounts()[0] != account {
 					t.Errorf("account mismatch on created wallet: have %v, want %v", event.Wallet.Accounts()[0], account)
@@ -319,8 +319,8 @@ func TestWalletNotifications(t *testing.T) {
 			}
 			select {
 			case event := <-updates:
-				if event.Arrive {
-					t.Errorf("arrival event on account deletion")
+				if event.Kind != accounts.WalletDropped {
+					t.Errorf("non-drop event on account deletion")
 				}
 				if event.Wallet.Accounts()[0] != account {
 					t.Errorf("account mismatch on deleted wallet: have %v, want %v", event.Wallet.Accounts()[0], account)

accounts/keystore/keystore_wallet.go

@@ -36,16 +36,16 @@ func (w *keystoreWallet) URL() accounts.URL {
 	return w.account.URL
 }
 
-// Status implements accounts.Wallet, always returning "open", since there is no
-// concept of open/close for plain keystore accounts.
-func (w *keystoreWallet) Status() string {
+// Status implements accounts.Wallet, returning whether the account held by the
+// keystore wallet is unlocked or not.
+func (w *keystoreWallet) Status() (string, error) {
 	w.keystore.mu.RLock()
 	defer w.keystore.mu.RUnlock()
 
 	if _, ok := w.keystore.unlocked[w.account.Address]; ok {
-		return "Unlocked"
+		return "Unlocked", nil
 	}
-	return "Locked"
+	return "Locked", nil
 }
 
 // Open implements accounts.Wallet, but is a noop for plain wallets since there

accounts/manager.go

@@ -96,9 +96,10 @@ func (am *Manager) update() {
 		case event := <-am.updates:
 			// Wallet event arrived, update local cache
 			am.lock.Lock()
-			if event.Arrive {
+			switch event.Kind {
+			case WalletArrived:
 				am.wallets = merge(am.wallets, event.Wallet)
-			} else {
+			case WalletDropped:
 				am.wallets = drop(am.wallets, event.Wallet)
 			}
 			am.lock.Unlock()

accounts/usbwallet/ledger_hub.go → accounts/usbwallet/hub.go

@@ -14,10 +14,6 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// This file contains the implementation for interacting with the Ledger hardware
-// wallets. The wire protocol spec can be found in the Ledger Blue GitHub repo:
-// https://raw.githubusercontent.com/LedgerHQ/blue-app-eth/master/doc/ethapp.asc
-
 package usbwallet
 
 import (
@@ -33,24 +29,28 @@ import (
 )
 
 // LedgerScheme is the protocol scheme prefixing account and wallet URLs.
-var LedgerScheme = "ledger"
+const LedgerScheme = "ledger"
 
-// ledgerDeviceIDs are the known device IDs that Ledger wallets use.
-var ledgerDeviceIDs = []deviceID{
-	{Vendor: 0x2c97, Product: 0x0000}, // Ledger Blue
-	{Vendor: 0x2c97, Product: 0x0001}, // Ledger Nano S
-}
+// TrezorScheme is the protocol scheme prefixing account and wallet URLs.
+const TrezorScheme = "trezor"
+
+// refreshCycle is the maximum time between wallet refreshes (if USB hotplug
+// notifications don't work).
+const refreshCycle = time.Second
 
-// Maximum time between wallet refreshes (if USB hotplug notifications don't work).
-const ledgerRefreshCycle = time.Second
+// refreshThrottling is the minimum time between wallet refreshes to avoid USB
+// trashing.
+const refreshThrottling = 500 * time.Millisecond
 
-// Minimum time between wallet refreshes to avoid USB trashing.
-const ledgerRefreshThrottling = 500 * time.Millisecond
+// Hub is a accounts.Backend that can find and handle generic USB hardware wallets.
+type Hub struct {
+	scheme     string                  // Protocol scheme prefixing account and wallet URLs.
+	vendorID   uint16                  // USB vendor identifier used for device discovery
+	productIDs []uint16                // USB product identifiers used for device discovery
+	makeDriver func(log.Logger) driver // Factory method to construct a vendor specific driver
 
-// LedgerHub is a accounts.Backend that can find and handle Ledger hardware wallets.
-type LedgerHub struct {
 	refreshed   time.Time               // Time instance when the list of wallets was last refreshed
-	wallets     []accounts.Wallet       // List of Ledger devices currently tracking
+	wallets     []accounts.Wallet       // List of USB wallet devices currently tracking
 	updateFeed  event.Feed              // Event feed to notify wallet additions/removals
 	updateScope event.SubscriptionScope // Subscription scope tracking current live listeners
 	updating    bool                    // Whether the event notification loop is running
@@ -65,11 +65,25 @@ type LedgerHub struct {
 }
 
 // NewLedgerHub creates a new hardware wallet manager for Ledger devices.
-func NewLedgerHub() (*LedgerHub, error) {
+func NewLedgerHub() (*Hub, error) {
+	return newHub(LedgerScheme, 0x2c97, []uint16{0x0000 /* Ledger Blue */, 0x0001 /* Ledger Nano S */}, newLedgerDriver)
+}
+
+// NewTrezorHub creates a new hardware wallet manager for Trezor devices.
+func NewTrezorHub() (*Hub, error) {
+	return newHub(TrezorScheme, 0x534c, []uint16{0x0001 /* Trezor 1 */}, newTrezorDriver)
+}
+
+// newHub creates a new hardware wallet manager for generic USB devices.
+func newHub(scheme string, vendorID uint16, productIDs []uint16, makeDriver func(log.Logger) driver) (*Hub, error) {
 	if !hid.Supported() {
 		return nil, errors.New("unsupported platform")
 	}
-	hub := &LedgerHub{
+	hub := &Hub{
+		scheme:     scheme,
+		vendorID:   vendorID,
+		productIDs: productIDs,
+		makeDriver: makeDriver,
 		quit:       make(chan chan error),
 	}
 	hub.refreshWallets()
@@ -77,8 +91,8 @@ func NewLedgerHub() (*LedgerHub, error) {
 }
 
 // Wallets implements accounts.Backend, returning all the currently tracked USB
-// devices that appear to be Ledger hardware wallets.
-func (hub *LedgerHub) Wallets() []accounts.Wallet {
+// devices that appear to be hardware wallets.
+func (hub *Hub) Wallets() []accounts.Wallet {
 	// Make sure the list of wallets is up to date
 	hub.refreshWallets()
 
@@ -92,17 +106,17 @@ func (hub *LedgerHub) Wallets() []accounts.Wallet {
 
 // refreshWallets scans the USB devices attached to the machine and updates the
 // list of wallets based on the found devices.
-func (hub *LedgerHub) refreshWallets() {
+func (hub *Hub) refreshWallets() {
 	// Don't scan the USB like crazy it the user fetches wallets in a loop
 	hub.stateLock.RLock()
 	elapsed := time.Since(hub.refreshed)
 	hub.stateLock.RUnlock()
 
-	if elapsed < ledgerRefreshThrottling {
+	if elapsed < refreshThrottling {
 		return
 	}
-	// Retrieve the current list of Ledger devices
-	var ledgers []hid.DeviceInfo
+	// Retrieve the current list of USB wallet devices
+	var devices []hid.DeviceInfo
 
 	if runtime.GOOS == "linux" {
 		// hidapi on Linux opens the device during enumeration to retrieve some infos,
@@ -117,10 +131,10 @@ func (hub *LedgerHub) refreshWallets() {
 			return
 		}
 	}
-	for _, info := range hid.Enumerate(0, 0) { // Can't enumerate directly, one valid ID is the 0 wildcard
-		for _, id := range ledgerDeviceIDs {
-			if info.VendorID == id.Vendor && info.ProductID == id.Product {
-				ledgers = append(ledgers, info)
+	for _, info := range hid.Enumerate(hub.vendorID, 0) {
+		for _, id := range hub.productIDs {
+			if info.ProductID == id && info.Interface == 0 {
+				devices = append(devices, info)
 				break
 			}
 		}
@@ -132,22 +146,29 @@ func (hub *LedgerHub) refreshWallets() {
 	// Transform the current list of wallets into the new one
 	hub.stateLock.Lock()
 
-	wallets := make([]accounts.Wallet, 0, len(ledgers))
+	wallets := make([]accounts.Wallet, 0, len(devices))
 	events := []accounts.WalletEvent{}
 
-	for _, ledger := range ledgers {
-		url := accounts.URL{Scheme: LedgerScheme, Path: ledger.Path}
+	for _, device := range devices {
+		url := accounts.URL{Scheme: hub.scheme, Path: device.Path}
 
 		// Drop wallets in front of the next device or those that failed for some reason
-		for len(hub.wallets) > 0 && (hub.wallets[0].URL().Cmp(url) < 0 || hub.wallets[0].(*ledgerWallet).failed()) {
-			events = append(events, accounts.WalletEvent{Wallet: hub.wallets[0], Arrive: false})
+		for len(hub.wallets) > 0 {
+			// Abort if we're past the current device and found an operational one
+			_, failure := hub.wallets[0].Status()
+			if hub.wallets[0].URL().Cmp(url) >= 0 || failure == nil {
+				break
+			}
+			// Drop the stale and failed devices
+			events = append(events, accounts.WalletEvent{Wallet: hub.wallets[0], Kind: accounts.WalletDropped})
 			hub.wallets = hub.wallets[1:]
 		}
 		// If there are no more wallets or the device is before the next, wrap new wallet
 		if len(hub.wallets) == 0 || hub.wallets[0].URL().Cmp(url) > 0 {
-			wallet := &ledgerWallet{hub: hub, url: &url, info: ledger, log: log.New("url", url)}
+			logger := log.New("url", url)
+			wallet := &wallet{hub: hub, driver: hub.makeDriver(logger), url: &url, info: device, log: logger}
 
-			events = append(events, accounts.WalletEvent{Wallet: wallet, Arrive: true})
+			events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletArrived})
 			wallets = append(wallets, wallet)
 			continue
 		}
@@ -160,7 +181,7 @@ func (hub *LedgerHub) refreshWallets() {
 	}
 	// Drop any leftover wallets and set the new batch
 	for _, wallet := range hub.wallets {
-		events = append(events, accounts.WalletEvent{Wallet: wallet, Arrive: false})
+		events = append(events, accounts.WalletEvent{Wallet: wallet, Kind: accounts.WalletDropped})
 	}
 	hub.refreshed = time.Now()
 	hub.wallets = wallets
@@ -173,8 +194,8 @@ func (hub *LedgerHub) refreshWallets() {
 }
 
 // Subscribe implements accounts.Backend, creating an async subscription to
-// receive notifications on the addition or removal of Ledger wallets.
-func (hub *LedgerHub) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription {
+// receive notifications on the addition or removal of USB wallets.
+func (hub *Hub) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription {
 	// We need the mutex to reliably start/stop the update loop
 	hub.stateLock.Lock()
 	defer hub.stateLock.Unlock()
@@ -190,16 +211,13 @@ func (hub *LedgerHub) Subscribe(sink chan<- accounts.WalletEvent) event.Subscrip
 	return sub
 }
 
-// updater is responsible for maintaining an up-to-date list of wallets stored in
-// the keystore, and for firing wallet addition/removal events. It listens for
-// account change events from the underlying account cache, and also periodically
-// forces a manual refresh (only triggers for systems where the filesystem notifier
-// is not running).
-func (hub *LedgerHub) updater() {
+// updater is responsible for maintaining an up-to-date list of wallets managed
+// by the USB hub, and for firing wallet addition/removal events.
+func (hub *Hub) updater() {
 	for {
 		// TODO: Wait for a USB hotplug event (not supported yet) or a refresh timeout
 		// <-hub.changes
-		time.Sleep(ledgerRefreshCycle)
+		time.Sleep(refreshCycle)
 
 		// Run the wallet refresher
 		hub.refreshWallets()

accounts/usbwallet/usbwallet.go → accounts/usbwallet/internal/trezor/trezor.go

@@ -14,12 +14,33 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-// Package usbwallet implements support for USB hardware wallets.
-package usbwallet
+// This file contains the implementation for interacting with the Trezor hardware
+// wallets. The wire protocol spec can be found on the SatoshiLabs website:
+// https://doc.satoshilabs.com/trezor-tech/api-protobuf.html
 
-// deviceID is a combined vendor/product identifier to uniquely identify a USB
-// hardware device.
-type deviceID struct {
-	Vendor  uint16 // The Vendor identifer
-	Product uint16 // The Product identifier
+//go:generate protoc --go_out=Mgoogle/protobuf/descriptor.proto=github.com/golang/protobuf/protoc-gen-go/descriptor,import_path=trezor:. types.proto messages.proto
+
+// Package trezor contains the wire protocol wrapper in Go.
+package trezor
+
+import (
+	"reflect"
+
+	"github.com/golang/protobuf/proto"
+)
+
+// Type returns the protocol buffer type number of a specific message. If the
+// message is nil, this method panics!
+func Type(msg proto.Message) uint16 {
+	return uint16(MessageType_value["MessageType_"+reflect.TypeOf(msg).Elem().Name()])
+}
+
+// Name returns the friendly message type name of a specific protocol buffer
+// type numbers.
+func Name(kind uint16) string {
+	name := MessageType_name[int32(kind)]
+	if len(name) < 12 {
+		return name
+	}
+	return name[12:]
 }

accounts/usbwallet/internal/trezor/types.proto

+// This file originates from the SatoshiLabs Trezor `common` repository at:
+//   https://github.com/trezor/trezor-common/blob/master/protob/types.proto
+// dated 28.07.2017, commit dd8ec3231fb5f7992360aff9bdfe30bb58130f4b.
+
+/**
+ * Types for TREZOR communication
+ *
+ * @author	Marek Palatinus <slush@satoshilabs.com>
+ * @version	1.2
+ */
+
+// Sugar for easier handling in Java
+option java_package = "com.satoshilabs.trezor.lib.protobuf";
+option java_outer_classname = "TrezorType";
+
+import "google/protobuf/descriptor.proto";
+
+/**
+ * Options for specifying message direction and type of wire (normal/debug)
+ */
+extend google.protobuf.EnumValueOptions {
+	optional bool wire_in = 50002;		// message can be transmitted via wire from PC to TREZOR
+	optional bool wire_out = 50003;		// message can be transmitted via wire from TREZOR to PC
+	optional bool wire_debug_in = 50004;	// message can be transmitted via debug wire from PC to TREZOR
+	optional bool wire_debug_out = 50005;	// message can be transmitted via debug wire from TREZOR to PC
+	optional bool wire_tiny = 50006;	// message is handled by TREZOR when the USB stack is in tiny mode
+	optional bool wire_bootloader = 50007;  // message is only handled by TREZOR Bootloader
+}
+
+/**
+ * Type of failures returned by Failure message
+ * @used_in Failure
+ */
+enum FailureType {
+	Failure_UnexpectedMessage = 1;
+	Failure_ButtonExpected = 2;
+	Failure_DataError = 3;
+	Failure_ActionCancelled = 4;
+	Failure_PinExpected = 5;
+	Failure_PinCancelled = 6;
+	Failure_PinInvalid = 7;
+	Failure_InvalidSignature = 8;
+	Failure_ProcessError = 9;
+	Failure_NotEnoughFunds = 10;
+	Failure_NotInitialized = 11;
+	Failure_FirmwareError = 99;
+}
+
+/**
+ * Type of script which will be used for transaction output
+ * @used_in TxOutputType
+ */
+enum OutputScriptType {
+	PAYTOADDRESS = 0;	// used for all addresses (bitcoin, p2sh, witness)
+	PAYTOSCRIPTHASH = 1;	// p2sh address (deprecated; use PAYTOADDRESS)
+	PAYTOMULTISIG = 2;	// only for change output
+	PAYTOOPRETURN = 3;	// op_return
+	PAYTOWITNESS = 4;	// only for change output
+	PAYTOP2SHWITNESS = 5;	// only for change output
+}
+
+/**
+ * Type of script which will be used for transaction output
+ * @used_in TxInputType
+ */
+enum InputScriptType {
+	SPENDADDRESS = 0;		// standard p2pkh address
+	SPENDMULTISIG = 1;		// p2sh multisig address
+	EXTERNAL = 2;			// reserved for external inputs (coinjoin)
+	SPENDWITNESS = 3;		// native segwit
+	SPENDP2SHWITNESS = 4;		// segwit over p2sh (backward compatible)
+}
+
+/**
+ * Type of information required by transaction signing process
+ * @used_in TxRequest
+ */
+enum RequestType {
+	TXINPUT = 0;
+	TXOUTPUT = 1;
+	TXMETA = 2;
+	TXFINISHED = 3;
+	TXEXTRADATA = 4;
+}
+
+/**
+ * Type of button request
+ * @used_in ButtonRequest
+ */
+enum ButtonRequestType {
+	ButtonRequest_Other = 1;
+	ButtonRequest_FeeOverThreshold = 2;
+	ButtonRequest_ConfirmOutput = 3;
+	ButtonRequest_ResetDevice = 4;
+	ButtonRequest_ConfirmWord = 5;
+	ButtonRequest_WipeDevice = 6;
+	ButtonRequest_ProtectCall = 7;
+	ButtonRequest_SignTx = 8;
+	ButtonRequest_FirmwareCheck = 9;
+	ButtonRequest_Address = 10;
+	ButtonRequest_PublicKey = 11;
+}
+
+/**
+ * Type of PIN request
+ * @used_in PinMatrixRequest
+ */
+enum PinMatrixRequestType {
+	PinMatrixRequestType_Current = 1;
+	PinMatrixRequestType_NewFirst = 2;
+	PinMatrixRequestType_NewSecond = 3;
+}
+
+/**
+ * Type of recovery procedure. These should be used as bitmask, e.g.,
+ * `RecoveryDeviceType_ScrambledWords | RecoveryDeviceType_Matrix`
+ * listing every method supported by the host computer.
+ *
+ * Note that ScrambledWords must be supported by every implementation
+ * for backward compatibility; there is no way to not support it.
+ *
+ * @used_in RecoveryDevice
+ */
+enum RecoveryDeviceType {
+	// use powers of two when extending this field
+	RecoveryDeviceType_ScrambledWords = 0;		// words in scrambled order
+	RecoveryDeviceType_Matrix = 1;				// matrix recovery type
+}
+
+/**
+ * Type of Recovery Word request
+ * @used_in WordRequest
+ */
+enum WordRequestType {
+	WordRequestType_Plain = 0;
+	WordRequestType_Matrix9 = 1;
+	WordRequestType_Matrix6 = 2;
+}
+
+/**
+ * Structure representing BIP32 (hierarchical deterministic) node
+ * Used for imports of private key into the device and exporting public key out of device
+ * @used_in PublicKey
+ * @used_in LoadDevice
+ * @used_in DebugLinkState
+ * @used_in Storage
+ */
+message HDNodeType {
+	required uint32 depth = 1;
+	required uint32 fingerprint = 2;
+	required uint32 child_num = 3;
+	required bytes chain_code = 4;
+	optional bytes private_key = 5;
+	optional bytes public_key = 6;
+}
+
+message HDNodePathType {
+	required HDNodeType node = 1;						// BIP-32 node in deserialized form
+	repeated uint32 address_n = 2;						// BIP-32 path to derive the key from node
+}
+
+/**
+ * Structure representing Coin
+ * @used_in Features
+ */
+message CoinType {
+	optional string coin_name = 1;
+	optional string coin_shortcut = 2;
+	optional uint32 address_type = 3 [default=0];
+	optional uint64 maxfee_kb = 4;
+	optional uint32 address_type_p2sh = 5 [default=5];
+	optional string signed_message_header = 8;
+	optional uint32 xpub_magic = 9 [default=76067358];	// default=0x0488b21e
+	optional uint32 xprv_magic = 10 [default=76066276];	// default=0x0488ade4
+	optional bool segwit = 11;
+	optional uint32 forkid = 12;
+}
+
+/**
+ * Type of redeem script used in input
+ * @used_in TxInputType
+ */
+message MultisigRedeemScriptType {
+	repeated HDNodePathType pubkeys = 1;					// pubkeys from multisig address (sorted lexicographically)
+	repeated bytes signatures = 2;						// existing signatures for partially signed input
+	optional uint32 m = 3;							// "m" from n, how many valid signatures is necessary for spending
+}
+
+/**
+ * Structure representing transaction input
+ * @used_in SimpleSignTx
+ * @used_in TransactionType
+ */
+message TxInputType {
+	repeated uint32 address_n = 1;						// BIP-32 path to derive the key from master node
+	required bytes prev_hash = 2;						// hash of previous transaction output to spend by this input
+	required uint32 prev_index = 3;						// index of previous output to spend
+	optional bytes script_sig = 4;						// script signature, unset for tx to sign
+	optional uint32 sequence = 5 [default=4294967295];			// sequence (default=0xffffffff)
+	optional InputScriptType script_type = 6 [default=SPENDADDRESS];	// defines template of input script
+	optional MultisigRedeemScriptType multisig = 7;				// Filled if input is going to spend multisig tx
+	optional uint64 amount = 8;						// amount of previous transaction output (for segwit only)
+}
+
+/**
+ * Structure representing transaction output
+ * @used_in SimpleSignTx
+ * @used_in TransactionType
+ */
+message TxOutputType {
+	optional string address = 1;			// target coin address in Base58 encoding
+	repeated uint32 address_n = 2;			// BIP-32 path to derive the key from master node; has higher priority than "address"
+	required uint64 amount = 3;			// amount to spend in satoshis
+	required OutputScriptType script_type = 4;	// output script type
+	optional MultisigRedeemScriptType multisig = 5; // defines multisig address; script_type must be PAYTOMULTISIG
+	optional bytes op_return_data = 6;		// defines op_return data; script_type must be PAYTOOPRETURN, amount must be 0
+}
+
+/**
+ * Structure representing compiled transaction output
+ * @used_in TransactionType
+ */
+message TxOutputBinType {
+	required uint64 amount = 1;
+	required bytes script_pubkey = 2;
+}
+
+/**
+ * Structure representing transaction
+ * @used_in SimpleSignTx
+ */
+message TransactionType {
+	optional uint32 version = 1;
+	repeated TxInputType inputs = 2;
+	repeated TxOutputBinType bin_outputs = 3;
+	repeated TxOutputType outputs = 5;
+	optional uint32 lock_time = 4;
+	optional uint32 inputs_cnt = 6;
+	optional uint32 outputs_cnt = 7;
+	optional bytes extra_data = 8;
+	optional uint32 extra_data_len = 9;
+}
+
+/**
+ * Structure representing request details
+ * @used_in TxRequest
+ */
+message TxRequestDetailsType {
+	optional uint32 request_index = 1;	// device expects TxAck message from the computer
+	optional bytes tx_hash = 2;		// tx_hash of requested transaction
+	optional uint32 extra_data_len = 3;	// length of requested extra data
+	optional uint32 extra_data_offset = 4;	// offset of requested extra data
+}
+
+/**
+ * Structure representing serialized data
+ * @used_in TxRequest
+ */
+message TxRequestSerializedType {
+	optional uint32 signature_index = 1;	// 'signature' field contains signed input of this index
+	optional bytes signature = 2;		// signature of the signature_index input
+	optional bytes serialized_tx = 3;	// part of serialized and signed transaction
+}
+
+/**
+ * Structure representing identity data
+ * @used_in IdentityType
+ */
+message IdentityType {
+	optional string proto = 1;			// proto part of URI
+	optional string user = 2;			// user part of URI
+	optional string host = 3;			// host part of URI
+	optional string port = 4;			// port part of URI
+	optional string path = 5;			// path part of URI
+	optional uint32 index = 6 [default=0];		// identity index
+}

cmd/geth/main.go

@@ -239,24 +239,30 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 		}
 		stateReader := ethclient.NewClient(rpcClient)
 
-		// Open and self derive any wallets already attached
+		// Open any wallets already attached
 		for _, wallet := range stack.AccountManager().Wallets() {
 			if err := wallet.Open(""); err != nil {
 				log.Warn("Failed to open wallet", "url", wallet.URL(), "err", err)
-			} else {
-				wallet.SelfDerive(accounts.DefaultBaseDerivationPath, stateReader)
 			}
 		}
 		// Listen for wallet event till termination
 		for event := range events {
-			if event.Arrive {
+			switch event.Kind {
+			case accounts.WalletArrived:
 				if err := event.Wallet.Open(""); err != nil {
 					log.Warn("New wallet appeared, failed to open", "url", event.Wallet.URL(), "err", err)
+				}
+			case accounts.WalletOpened:
+				status, _ := event.Wallet.Status()
+				log.Info("New wallet appeared", "url", event.Wallet.URL(), "status", status)
+
+				if event.Wallet.URL().Scheme == "ledger" {
+					event.Wallet.SelfDerive(accounts.DefaultLedgerBaseDerivationPath, stateReader)
 				} else {
-					log.Info("New wallet appeared", "url", event.Wallet.URL(), "status", event.Wallet.Status())
 					event.Wallet.SelfDerive(accounts.DefaultBaseDerivationPath, stateReader)
 				}
-			} else {
+
+			case accounts.WalletDropped:
 				log.Info("Old wallet dropped", "url", event.Wallet.URL())
 				event.Wallet.Close()
 			}

console/bridge.go

@@ -23,6 +23,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/ethereum/go-ethereum/accounts/usbwallet"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/robertkrimen/otto"
@@ -83,6 +84,49 @@ func (b *bridge) NewAccount(call otto.FunctionCall) (response otto.Value) {
 	return ret
 }
 
+// OpenWallet is a wrapper around personal.openWallet which can interpret and
+// react to certain error messages, such as the Trezor PIN matrix request.
+func (b *bridge) OpenWallet(call otto.FunctionCall) (response otto.Value) {
+	// Make sure we have an wallet specified to open
+	if !call.Argument(0).IsString() {
+		throwJSException("first argument must be the wallet URL to open")
+	}
+	wallet := call.Argument(0)
+
+	var passwd otto.Value
+	if call.Argument(1).IsUndefined() || call.Argument(1).IsNull() {
+		passwd, _ = otto.ToValue("")
+	} else {
+		passwd = call.Argument(1)
+	}
+	// Open the wallet and return if successful in itself
+	val, err := call.Otto.Call("jeth.openWallet", nil, wallet, passwd)
+	if err == nil {
+		return val
+	}
+	// Wallet open failed, report error unless it's a PIN entry
+	if !strings.HasSuffix(err.Error(), usbwallet.ErrTrezorPINNeeded.Error()) {
+		throwJSException(err.Error())
+	}
+	// Trezor PIN matrix input requested, display the matrix to the user and fetch the data
+	fmt.Fprintf(b.printer, "Look at the device for number positions\n\n")
+	fmt.Fprintf(b.printer, "7 | 8 | 9\n")
+	fmt.Fprintf(b.printer, "--+---+--\n")
+	fmt.Fprintf(b.printer, "4 | 5 | 6\n")
+	fmt.Fprintf(b.printer, "--+---+--\n")
+	fmt.Fprintf(b.printer, "1 | 2 | 3\n\n")
+
+	if input, err := b.prompter.PromptPassword("Please enter current PIN: "); err != nil {
+		throwJSException(err.Error())
+	} else {
+		passwd, _ = otto.ToValue(input)
+	}
+	if val, err = call.Otto.Call("jeth.openWallet", nil, wallet, passwd); err != nil {
+		throwJSException(err.Error())
+	}
+	return val
+}
+
 // UnlockAccount is a wrapper around the personal.unlockAccount RPC method that
 // uses a non-echoing password prompt to acquire the passphrase and executes the
 // original RPC method (saved in jeth.unlockAccount) with it to actually execute

console/console.go

@@ -160,10 +160,15 @@ func (c *Console) init(preload []string) error {
 		if err != nil {
 			return err
 		}
-		// Override the unlockAccount, newAccount and sign methods since these require user interaction.
-		// Assign these method in the Console the original web3 callbacks. These will be called by the jeth.*
-		// methods after they got the password from the user and send the original web3 request to the backend.
+		// Override the openWallet, unlockAccount, newAccount and sign methods since
+		// these require user interaction. Assign these method in the Console the
+		// original web3 callbacks. These will be called by the jeth.* methods after
+		// they got the password from the user and send the original web3 request to
+		// the backend.
 		if obj := personal.Object(); obj != nil { // make sure the personal api is enabled over the interface
+			if _, err = c.jsre.Run(`jeth.openWallet = personal.openWallet;`); err != nil {
+				return fmt.Errorf("personal.openWallet: %v", err)
+			}
 			if _, err = c.jsre.Run(`jeth.unlockAccount = personal.unlockAccount;`); err != nil {
 				return fmt.Errorf("personal.unlockAccount: %v", err)
 			}
@@ -173,6 +178,7 @@ func (c *Console) init(preload []string) error {
 			if _, err = c.jsre.Run(`jeth.sign = personal.sign;`); err != nil {
 				return fmt.Errorf("personal.sign: %v", err)
 			}
+			obj.Set("openWallet", bridge.OpenWallet)
 			obj.Set("unlockAccount", bridge.UnlockAccount)
 			obj.Set("newAccount", bridge.NewAccount)
 			obj.Set("sign", bridge.Sign)

internal/ethapi/api.go

@@ -230,22 +230,45 @@ func (s *PrivateAccountAPI) ListAccounts() []common.Address {
 type rawWallet struct {
 	URL      string             `json:"url"`
 	Status   string             `json:"status"`
-	Accounts []accounts.Account `json:"accounts"`
+	Failure  string             `json:"failure,omitempty"`
+	Accounts []accounts.Account `json:"accounts,omitempty"`
 }
 
 // ListWallets will return a list of wallets this node manages.
 func (s *PrivateAccountAPI) ListWallets() []rawWallet {
 	wallets := make([]rawWallet, 0) // return [] instead of nil if empty
 	for _, wallet := range s.am.Wallets() {
-		wallets = append(wallets, rawWallet{
+		status, failure := wallet.Status()
+
+		raw := rawWallet{
 			URL:      wallet.URL().String(),
-			Status:   wallet.Status(),
+			Status:   status,
 			Accounts: wallet.Accounts(),
-		})
+		}
+		if failure != nil {
+			raw.Failure = failure.Error()
+		}
+		wallets = append(wallets, raw)
 	}
 	return wallets
 }
 
+// OpenWallet initiates a hardware wallet opening procedure, establishing a USB
+// connection and attempting to authenticate via the provided passphrase. Note,
+// the method may return an extra challenge requiring a second open (e.g. the
+// Trezor PIN matrix challenge).
+func (s *PrivateAccountAPI) OpenWallet(url string, passphrase *string) error {
+	wallet, err := s.am.Wallet(url)
+	if err != nil {
+		return err
+	}
+	pass := ""
+	if passphrase != nil {
+		pass = *passphrase
+	}
+	return wallet.Open(pass)
+}
+
 // DeriveAccount requests a HD wallet to derive a new account, optionally pinning
 // it for later reuse.
 func (s *PrivateAccountAPI) DeriveAccount(url string, path string, pin *bool) (accounts.Account, error) {

internal/web3ext/web3ext.go

@@ -492,6 +492,11 @@ web3._extend({
 			call: 'personal_ecRecover',
 			params: 2
 		}),
+		new web3._extend.Method({
+			name: 'openWallet',
+			call: 'personal_openWallet',
+			params: 2
+		}),
 		new web3._extend.Method({
 			name: 'deriveAccount',
 			call: 'personal_deriveAccount',

node/config.go

@@ -393,11 +393,18 @@ func makeAccountManager(conf *Config) (*accounts.Manager, string, error) {
 		keystore.NewKeyStore(keydir, scryptN, scryptP),
 	}
 	if !conf.NoUSB {
+		// Start a USB hub for Ledger hardware wallets
 		if ledgerhub, err := usbwallet.NewLedgerHub(); err != nil {
 			log.Warn(fmt.Sprintf("Failed to start Ledger hub, disabling: %v", err))
 		} else {
 			backends = append(backends, ledgerhub)
 		}
+		// Start a USB hub for Trezor hardware wallets
+		if trezorhub, err := usbwallet.NewTrezorHub(); err != nil {
+			log.Warn(fmt.Sprintf("Failed to start Trezor hub, disabling: %v", err))
+		} else {
+			backends = append(backends, trezorhub)
+		}
 	}
 	return accounts.NewManager(backends...), ephemeral, nil
 }

vendor/github.com/golang/protobuf/LICENSE

+Go support for Protocol Buffers - Google's data interchange format
+
+Copyright 2010 The Go Authors.  All rights reserved.
+https://github.com/golang/protobuf
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+

vendor/github.com/golang/protobuf/proto/Makefile

+# Go support for Protocol Buffers - Google's data interchange format
+#
+# Copyright 2010 The Go Authors.  All rights reserved.
+# https://github.com/golang/protobuf
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+install:
+	go install
+
+test: install generate-test-pbs
+	go test
+
+
+generate-test-pbs:
+	make install
+	make -C testdata
+	protoc --go_out=Mtestdata/test.proto=github.com/golang/protobuf/proto/testdata,Mgoogle/protobuf/any.proto=github.com/golang/protobuf/ptypes/any:. proto3_proto/proto3.proto
+	make

vendor/github.com/golang/protobuf/protoc-gen-go/descriptor/Makefile

+# Go support for Protocol Buffers - Google's data interchange format
+#
+# Copyright 2010 The Go Authors.  All rights reserved.
+# https://github.com/golang/protobuf
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Not stored here, but descriptor.proto is in https://github.com/google/protobuf/
+# at src/google/protobuf/descriptor.proto
+regenerate:
+	@echo WARNING! THIS RULE IS PROBABLY NOT RIGHT FOR YOUR INSTALLATION
+	protoc --go_out=../../../../.. -I$(HOME)/src/protobuf/include $(HOME)/src/protobuf/include/google/protobuf/descriptor.proto

vendor/vendor.json

@@ -104,6 +104,18 @@
 			"revision": "54be5f394ed2c3e19dac9134a40a95ba5a017f7b",
 			"revisionTime": "2017-07-10T16:04:46Z"
 		},
+		{
+			"checksumSHA1": "yqF125xVSkmfLpIVGrLlfE05IUk=",
+			"path": "github.com/golang/protobuf/proto",
+			"revision": "748d386b5c1ea99658fd69fe9f03991ce86a90c1",
+			"revisionTime": "2017-07-26T21:28:29Z"
+		},
+		{
+			"checksumSHA1": "Z1gJ3PKzwBpOoPnTSEM5yd0zHYA=",
+			"path": "github.com/golang/protobuf/protoc-gen-go/descriptor",
+			"revision": "748d386b5c1ea99658fd69fe9f03991ce86a90c1",
+			"revisionTime": "2017-07-26T21:28:29Z"
+		},
 		{
 			"checksumSHA1": "p/8vSviYF91gFflhrt5vkyksroo=",
 			"path": "github.com/golang/snappy",